Astronauts were woken during the night to continue the hunt for an air leak on the International Space Station (ISS).

Crew members have been hunting for the source over several weeks.

But the search was stepped up a notch when the size of the leak appeared to grow on Monday; this erroneous reading turned out to have been caused by a temperature change onboard the ISS.

Analysis by ground teams traced the leak to the main work area inside a Russian ISS module called Zvezda.

This module contains life support equipment for the space station and also houses living quarters for two crew members.

Further analysis will be necessary to pinpoint the precise area from which air is escaping.

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